Assuming a 1024qb quantum computer, how long to brute force 1024bit RSA, 256bit AES and 512bit SHA512Thanks CodesInChaos and Uwe. @e-sushi I don't think question 1 has been answered. What I want to know is using Shor's algorithm on a 4qubit quantum supercomputer, would this take half the time to factor 1024bit RSA as it would a regular 2bit supercomputer. Then if we extrapolate upwards to 8qubit supercomputer through to 1024qubit and even 2048qubit. What sort of factorization speed increase do you get from adding more qubits? I originally thought quantum computers could have only 4 qubits. But it seems these days you can keep adding qubits up to the amount you want within technical reason.